import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Demo2 {

    public static void main(String[] args) throws SQLException {

        //创建DataSource
        DataSource dataSource = new MysqlDataSource();
        ((MysqlDataSource)dataSource).setUrl("jdbc:mysql://127.0.0.1:3306/test_11_27?characterEncoding=utf8&useSSL=false");
        ((MysqlDataSource)dataSource).setUser("root");
        ((MysqlDataSource)dataSource).setPassword("731889*a");

        //建立连接
        Connection connection = dataSource.getConnection();

        //构造sql语句
//        String sql = "select * from student";
        String sql = "select * from student where name = ?";
        PreparedStatement statement = connection.prepareStatement(sql);
        statement.setString(1,"赵子锐");
        //执行sql 与增删改不同了
        ResultSet resultSet = statement.executeQuery();

        //遍历结果
        //通过next方法可以获取到临时表中的每一行数据
        //获取完最后一行之后 再次进行获取 返回false
        //循环结束

        while(resultSet.next()){
            int id = resultSet.getInt("id");
            String name = resultSet.getString("name");
            System.out.println("id = " + id + ", name = " + name);
        }

        resultSet.close();
        statement.close();
        connection.close();
    }

}
